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How can I fix error F25 on Glow Worm boiler Flexicom24HX ?

The boiler shuts down intermittently with error F25. It will shut down after 1 day or last up to 7 days. There is no obvious reason why. The boiler is 3 - 4 years old. It works fine apart from this irritating problem

Bill
April 2010
Glow WormGlow Worm Flexicom24HXHeating, Home Heating SystemsGlow Boiler Day

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